What is happening? What's your error code and are you getting signed out of Live? If you're getting signed out of Xbox Live, you need to log into your Router and give your Xbox a Static IP. Set up your Xbox in System Settings to connect Manually. I copied all of the settings exactly and then just input them in the Manual menu. This should be done before setting up a Static IP on your Router. Make sure all of the numbers match and test your connection. After you do this and it works, you need to set up Port Forwarding. You need to open Port 53, 80, 88, and 3074 and make sure they are set for the IP you set on your Xbox. I used to have this same problem, but doing this set up, fixed everything for me. I hope it helps. They have detailed instructions on how to set this up on bungie.net but if you need any help, you can PM me and I will simplify it for you.